FUEL LIMIT VENT VALVE HAVING VAPOR PERMEABLE MEMBRANE

摘要

A fill limit vent valve configured for use with a reductant tank includes a valve body, a float and a vapor permeable membrane. The valve body can define an inner chamber and has a valve outlet. The float has a float body configured to be received within the inner chamber and configured to sealingly engage the valve body. The vapor permeable membrane can be configured to permit vapor to pass through while inhibiting liquid from passing through. The float is movable between (i) an open position wherein vapor flows along a first flow path through the valve inner chamber and out of the valve body; and (ii) a closed position wherein the float sealingly engages the valve body and precludes vapor from flowing along the first flow path while allowing flow along a second flow path through the vapor permeable membrane and out of the valve body.

主权项

1. A fill limit vent valve configured for use with a reductant tank, the fill limit vent valve comprising:
a valve body having a circumferential wall that extends between an upper tank mounting end and an opposite end, the valve body defining a valve body seat, at least one valve opening and a valve inner chamber; a vapor permeable membrane disposed adjacent to the at least one valve opening and configured to permit vapor to pass through the vapor permeable membrane and into the at least one valve opening while inhibiting liquid from passing therethrough; a float having a float body configured to be received within the valve inner chamber, the float further comprising a float seal configured to sealingly engage the valve body seat; and the float movable between (i) an open position wherein vapor flows along a first flow path through the valve inner chamber and out of the valve body; and (ii) a closed position wherein the float seal sealingly engages the valve body seat and precludes vapor from flowing along the first flow path, wherein vapor is permitted to flow along a second flow path through the vapor permeable membrane, through the at least one valve opening and out of the valve body.